[tools/onnx-subgraph] add multi subgraphs inference code

tools/onnx_subgraph/single_vs_multiple_onnx.py

@@ -36,6 +36,54 @@ class ModelInference:
     def __init__(self, model_path, subgraphsiostxt_path):
         self.model_path = model_path
         self.subgraphsiostxt_path = subgraphsiostxt_path
+        self.sessions, self.sorted_file_paths = self.load_sessions()
+
+    def load_sessions(self):
+        with open(self.subgraphsiostxt_path, 'r') as file:
+            content = file.read()
+        subgraph_order_map = {}
+        matches = re.findall(r'(\w+)subgraph(\d+): order(\d+)', content)
+
+        for match in matches:
+            subgraph_type, subgraph_number, order = match
+            # lower_subgraph_type = subgraph_type.lower()
+            file_path = os.path.join(self.model_path,
+                                     f"{subgraph_type}subgraph{subgraph_number}.onnx")
+            if int(order) in subgraph_order_map:
+                subgraph_order_map[int(order)].append(file_path)
+            else:
+                subgraph_order_map[int(order)] = [file_path]
+
+        sorted_file_paths = []
+        for order in sorted(subgraph_order_map.keys()):
+            sorted_file_paths.extend(subgraph_order_map[order])
+
+        sessions = [ort.InferenceSession(model) for model in sorted_file_paths]
+        return sessions, sorted_file_paths
+
+    def infer_multiple_onnx_models(self,
+                                   initial_input_data,
+                                   output_names_to_collect=None):
+        if output_names_to_collect is None:
+            return {}
+        input_data = initial_input_data
+        collected_outputs = {}
+
+        for i, (session,
+                model_file) in enumerate(zip(self.sessions, self.sorted_file_paths)):
+            input_names = [inp.name for inp in session.get_inputs()]
+            output_names = [out.name for out in session.get_outputs()]
+            model_input_data = {name: input_data[name] for name in input_names}
+            outputs = session.run(None, model_input_data)
+            current_model_outputs = dict(zip(output_names, outputs))
+
+            for output_name in output_names_to_collect:
+                if output_name in current_model_outputs:
+                    collected_outputs[output_name] = current_model_outputs[output_name]
+
+            if i < len(self.sessions) - 1:
+                input_data.update(current_model_outputs)
+        return collected_outputs
 
     def infer_single_onnx_model(model_file, input_data):
         session = ort.InferenceSession(model_file)
@@ -120,3 +168,11 @@ def prepare_initial_input_data(onnx_model_path, default_input_data):
     output_single = ModelInference.infer_single_onnx_model(args.single,
                                                            initial_input_data)
     print("Single model inference completed!")
+
+    # Retrieve all output names from the single model
+    output_names_list = list(output_single.keys())
+
+    # Perform inference using multiple split subgraph models
+    output_multiple = model_inference.infer_multiple_onnx_models(
+        initial_input_data, output_names_list)
+    print("Multiple subgraph inference completed!")